The mechanism oscillates at a frequency of 36,600 vph.For Baselworld 2017, Zenith is releasing the Chronomaster El Primero Grande Date Full Open watch. Featuring a dial carved in sapphire, a dual-disc sun and moon phase, and for the first time in the Grande Date, a fully skeletonized architecture, it’s hard to not be both enamored and a little overwhelmed by the high-energy design. There is a straight-line lever escapement, a self-compensating Breguet balance spring, a monometallic balance that's adjusted to 5 positions, and an index regulator. It's constructed with 41 jewels, 322 components, and a shock absorber mechanism. The automatic self-winding Zenith El Primero Caliber 4047 movement is rhodium-plated with fausses cotes embellishment.
The 15.6mm thick case, dial, and movement are all signed. It's water resistant to 50 meters/165 feet, and there is a 50-hour power reserve at full wind.
A running seconds sub dial is visible inside the cutout at 9 o'clock, and there is a double-digit window with a patented 3-disk grande date at 2 o'clock. The column wheel chronograph stop/watch has round pushbuttons and a large blue central seconds counter hand. There is a moon phase subsidiary dial with sunray design, a day/night indicator at 6 o'clock, and a 30-minute dial at 3 o'clock. It has applied rhodium plated rose gold baton hour index markers with luminescent tips, and skeletonized baton hands with luminescent inserts. There is a printed black minute indicator track with an outer tachymeter scale.
The dial is silvered with an open-worked figure eight cutout at 9 o'clock, with a fine rose gold rim that's secured by 3 gun-metal blued screws. The 45mm diameter solid three-body case is polished with brushed downturned lugs and an angled bezel. It has a leather strap with a matching steel deployant buckle, a scratch resistant sapphire crystal, and a sapphire display case back with anti-reflective coating on both surfaces. This is a stainless steel Zenith El Primero Chronomaster Open Grande Date, 03.2160.4047/01.c713. More about El Primero Chronomaster Open Grande Date SS / Leather
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